Applicator roll with metering means



y 4, 1968 w. A. NIKKEL 3,383,234

APPLICATOR ROLL WITH METERING MEANS Filed Aug. 31, 1964 4 Sheets-Sheet 1V E L INVENTOR.

Willem A. Nikkel Y ATTORNEY GOL/ M.S. F.

May 14, 1968 w. A. NIKKEL APPLICATOR ROLL WITH METERING MEANS Filed Aug.31, 1964 4 Sheets-Sheet 2 .004 .006 .008 .OIO .Ol2 .Ol4 .0l6

Doctor Roll Clearance Y R- Wdlem A.N|kke| Fig. /4 BY ATTORNEY y 4, 1968w. A. NIKKEL 3,383,234

APPLICATOR ROLL WITH METERING MEANS Filed Aug. 31, 1964 4 Sheets-Sheet 3Fig-9 Fig. /0

Willem A. Nikkei BY n :w Z'/ j INVENTOR.

ATTORNEY May 14, 1968 w. A. NIKKEL APPLICATOR ROLL WITH METERING MEANS 4Sheets-Sheet Filed Aug. 51, 1964 Fig. 1/

Fig. /3 INVENTOR.

Willem A. Nikkel ATTORNEY United States Patent 3,383,234 APPLICATOR ROLLWITH METERING MEANS Willem A. Nikkei, Bellmawr, N..l., assiguor, bymesne assignments, to Samuel M. Langston Company, Camden, N.J., acorporation of New Jersey Continuation-impart of application Ser. No.275,908,

Apr. 26, 1963. This application Aug. 31, 1964, Ser.

2 Claims. (Cl. 117-37) ABSTRACT OF THE DESCLOSURE A doctor roll isspaced .005 to .016 inches from an adhesive applicator roller havingdiscrete cells on its periphery to control the amount of adhesive in thecells and substantially remove all adhesive from the surface of theapplicator roller.

This application is a continuation-impart of Ser. No. 275,908, filedApril 26, 1963, and now abandoned.

The present invention is directed to the manufacture of corrugated boardand more specifically, to the application of the adhesive to a web ofcorrugated material prior to the bonding of a web of liner material toone or both sides thereof.

The present invention is, therefore, most particularly concerned withthose stages in the manufacture of corrugated boa-rd generally referredto as the single face and double backer operations. In a conventionalsingle face operation, a web of core material is passed through a pairof intermeshing c-orrugating rolls where a series of corrugations orflutes are for-med in the web. The corrugated Web or medium isthereafter retained in the corrugations of one of the corrugating rollsfor a short distance, then allowed to spring or fluff out from thecorrugations to contact the surface of the applicator roll whereadhesive is applied to the flute tips of the medium. The corrugatedmedium, with adhesive applied, is then forced back into the corrugationsof the roll and passes through a nip formed by the corrugating roll anda second, pressure roller where it is united under pressure to a web ofuncorrugated liner material. The resulting laminated web of corrugatedmedium and liner material, generally referred to as single faced board,is then conveyed to a storage bridge preparatory to the bonding of asecond, or outside liner, thereto in the double backer operation.

In the double backer operation, the single faced board is passed througha pressure nip formed by a rider roll and an adhesive applicator rollwhere adhesive is applied by the applicator roll to the flute tips ofthe medium opposite the inside liner. The single face board and a Web ofoutside liner material then pass through a hot plate section where theyare joined under heat and pressure.

In both the operations described above, conventional practice is toutilize a smooth or slightly roughened surfaced adhesive applicator rollrotating in -a pan of adhesive and contacting the flute tips of themedium as the medium is conveyed past the roll. Again, in bothoperations, the usual practice is to utilize a reduction gearing system,referred to as a tapered drive, to maintain the surface speed of theapplicator below that of the medium to obtain a wiping or smearing ofthe adhesive onto the flute tips. -As an aid in controlling the amountof adhesive ap plied to the medium, a doctor blade or roller is providedwith the clearance between the doctor device and the applicator rolladjusted to give the desired thickness of film on the surface of theapplicator roll.

In the double backer operation, as the single faced board is passedbetween the rider roll and applicator roll the pressure at this nip isresisted mainly by the structural 3,383,234 Patented May 14, 1968 Seestrength of the medium. Hence, care must be taken to maintain thispressure below that which will crush the medium; yet the pressure mustbe great enough to insure adhesive transfer adequate to subsequentlybond the outside liner to the medium. Generally, to obtain this medianpressure the clearance between the rider roll and applicator roll is setat that which will give the desired pressure for the caliper of singlefaced board to be manufactured.

While the practices outlined above are widely followed, many inherentdisadvantages exist in this type of system. For example, because theadhesive must be wiped or smeared onto the medium to obtain suflicienttransfer, a much larger area of the flute is covered than is actuallynecessary. Thus, rather than adhesive being applied only at the point ofsubsequent contact between the medium and the line-r, a substantiallylarger area is covered with consequent adhesive waste. Additionally, thelarger application area enhances the rate of adhesive penetration intothe somewhat porous medium and results in increased losses throughabsorption. Further, the use of a tapered drive to maintain theapplicator roll surface speed below that of the medium necessitatesadditional equipment, which, besides being a possible source ofmalfunction, must be carefully adjusted to insure a fairly constant rateof adhesive transfer during speed fluctuations in the corrugated boardmanufacturing process. Another undesirable feature of utilizing a smoothor slightly roughened surface applicator roll carrying a surface layerof adhesive is the tendency of the adhesive to be slung from the surfaceof the roll at high speeds.

Many of these disadvantages can be overcome by utilizing an applicatorroll of the type disclosed in my copending application, Serial No.275,908. This type of roll, rather than having a smooth or slightlyroughened surface, is provided with a plurality of shallow cells formedin its surface. As the applicator rotates in a reservoir of adhesive,the shallow cells are each filled with adhesive and any surface filmadhering to the rolls wiped off by means of a doctor blade. As theapplicator contacts the flute tips, the adhesive is printed thereon in aseries of small, discrete masses of adhesive. SinCe the cells, andhence, the masses of adhesive, are closely spaced and the adhesive stillflowable, the small masses of adhesive join to form a continuous,unbroken line of adhesive extending the length of the flute at its tip.Due to the fact that the adhesive is printed rather than wiped onto theflute, the area of adhesive application is confined to the exact pointon the medium where it is needed for subsequent adhesion of the linerthereto and adhesive waste is avoided. Additionally, the necessity ofutilizing a tapered drive to obtain wiping is eliminated and theapplicator roll is conveniently run at one to one ratio with the mediumactually driving the roll through frictional contact. It should also benoted that because the adhesive is confined within the small cells, anytendency of the adhesive to sling from the roll at high speeds iseliminated.

While all of these advantages accure through :the use of a celledapplicator roll it has been found that further improvement may be madeto obtain additional advantageous results. Thus, as noted above, in mysaid copending application a doctor blade is utilized to scrape thesurface film of adhesive from the roll. It has been found, however, thatthe scraping action of the blade does not always entirely remove excessadhesive from the roll surface. Additionally, the scraping of the bladesubjects the roll to an abrasive action which may eventually requirereplacement or reworking of the roll. As disclosed in my said copendingapplication, the celled applicator roll is used at a double backerstation. In this environment, the rate of adhesive consumption iscontrolled by varying the pressure exerted on the single face board bythe rider roll and applicator roll and the medium of the single facedboard is thereby caused to press into the cells of :the roll to agreater or lesser extent and draw more or less adhesive from the cells.While the rate of adhesive consumption may, in this manner, be variedapproximately 60%, difliculties may arise through board calipervariations and limitations on nip pressures imposed by the structuredstrength of the medium. For example, if a fixed clearance is maintainedbetween the rider roll and applicator roll, any variation in boardcaliper will affect the nip pressure. Thus, if board of higher thandesired caliper passes through the nip, the medium may be crushed.Conversely, if a portion of the board is thinner than desired, the nippressure may be itisufficient to obtain adequate adhesive transfer. Ineither case, of course, board of inferior strength is likely to beproduced. This situation is further complicated where a portion of theboard has one edge of high caliper tapering transversely to an oppositeedge of low caliper. In this case, the thick edge of the board will becrushed and the thin edge receive insufficient adhesive.

Through invention of the present application, however, all of theadvantages of using a celled applicator roll are sti l obtained whilethe limitations noted above are ob viated. Thus, in the presentinvention, a celled applicator roll is utilized as in my priorapplication, but rather than a doctor blade, a rotating doctor roll,spaced from the applicator roll is provided. Contrary to what might beexpected, and for reasons not fully analyzed, maintaining a clearancebetween the doctor roll and the applicator roll does not result in asurface film on the roll but instead, substantially completely cleansthe surface of the roll. Further, by varing the gap or clearance betweenthe doctor roll and applicator roll, not only may the surface of theroll be maintained substantially free of adhesive, but the quantity ofadhesive in the cells may be carefully controlled. It will be seen,therefore, that not only is surface wearing of the applicator rollavoided by completely eliminating any contact by the doctor device, buta positive control of the rate of adhesive consumption is providedthrough metering of the amount of adhesive in the cells of theapplicator roll.

Through a further feature of the present invention this unique means ofadhesive metering may be combined with a pressure control system at thedouble backer station to insure adequate adhesive transfer withoutdanger of flute crushing despite variations in board caliper in eitherthe machine or cross machine directions.

These and other features advantages of the present invention will becomemore readily apparent from the following detailed description wherein:

FIGURE 1 is a somewhat schematic view of the corrugating process;

FIGURE 2 is a view of the adhesive applicating station at the singlefacer;

FIGURE 3 is a view of the adhesive applicating station at the doublebacker;

FIGURE 4 is a perspective view of a portion of a celled applicator roll;

FIGURE 5 is a sectional view of a portion of the applicator roll;

FIGURE 6 is a view of medium having adhesive applied thereto accordingto the prior art;

FIGURE 7 is a view of medium having adhesive applied thereto with acelled applicator roll;

FIGURE 8 is a view of the pressure control circuit;

FIGURE 9 is a view of a portion of the circuit of FIGURE 8 showing adifferent position of tne valves;

FIGURE 10 is a view similar to FIGURE 9 showing another position of thevalves;

FIGURE 11 is a perspective view of the adhesive applicator system at thedouble backer;

FIGURE 12 is a view of the rider roll and applicator roll showing oneposition thereof;

FIGURE I3 is another view of the rider roll and applicator roll showinga different position thereof; and

FIGURE 14 is a graph showing rate of adhesive consumption with Varyingdoctor roll clearances.

Referring to FIGURE 1 of the drawings, corrugating apparatus is shownwhich, with the exception of features of the present invention, is forthe most part conventional. Thus, a pair of unwind stands may beprovided, supporting rolls of corrugating medium 1 and liner material 2.Corrugating medium 1 is passed over a preheater 3 and thence, between apair of intermeshing corrugating rollers 4 and 5, Where a series offlutes or corrugations is formed therein. The medium 1 is retained inthe corrugations of roll 5 as it is conveyed past an adhesive applicatorstation 6, where a series of closely spaced, discrete masses of adhesiveare printed on the flute tips thereof. Simultaneously, liner material 2is trained over preheater 7 and thence around pressure roll 8 forming anip with roll 5 where the liner and medium are joined to form singlefaced board 9. Board 9 is then conveyed to storage bridge 10 where it isaccumulated prior to joining a second, or outside liner thereto. Fromstorage bridge 10 the single faced board is trained over preheater 11and thence, past a second adhesive applicator station 12 where a secondseries of closely spaced, discrete masses of adhesive are applied to theflute tips of the medium opposite the layer of liner material. A roll ofoutside liner material 13 is trained over preheaters l4 and 15 andthence, to a hot plate section 16 where it is joined under heat andpressure to the single faced board to form double faced board 17.

Turning now to FIGURES 2 and 4-7 of the drawings, the adhesiveapplicator station 6 will be described in detail. As seen in FIGURE 2,the adhesive applicator station 6 includes a reservoir 18 of adhesive 19with a portion of the applicator roll 20 submerged in the adhesive. Adoctor roll 21 is positioned in spaced relation to the applicator roll20 and a scraper blade 22 may be provided to clean the surface of thedoctor roll. Referring to FIGURES 4 and 5 it will be seen that theapplicator roll 20 is provided with a plurality of small, closely spacedcells 23 in its surface 24 with each cell conveniently formed as atruncated pyramid exhibiting a bottom wall 25 and sloping side Walls 26.

In conventional single face operations, as the medium leaves the nipformed by the intermeshing corrugating rolls, it is allowed to springaway from the surface of the roll carrying it, or fluff out, to contactthe smooth or slightly roughened surface of an applicator roll where aquantity of adhesive is wiped or smeared on the flutes thereof. Theeffect of this wiping action is seen in FIG- URE 6 where a web ofcorrugating medium having flutes 27 is shown, traveling in the directionindicated by the arrow. As a smooth surfaced roller having a surfacefilm of adhesive contacts the flute tips, the adhesive is wiped orsmeared thereon, leaving an unsymmetrical mass 28 covering anappreciable portion of the flute tip.

In contrast, where a celled applicator roll is used, the medium may beretained in the corrugations of the roll and the surface speed of theroll and that of the medium maintained substantially equal. In thismanner the adhesive is printed as shown in FIGURE 7, on the exact tip ofeach flute 27 leaving a small, substantially symmetrical mass ofadhesive 28 deposited thereon.

In order to obtain the optimum benefits of a celled, as opposed to asmooth, surfaced applicator roll, the surface of the roll should bemaintained free of adhesive and all adhesive carried within the cells ofthe roll. One manner of achieving this is, as disclosed in my saidcopending application, by utilizing a doctor blade scraping the surfaceof the roll. It will be apparent, however, that this scraping action hasan abrading effect on the applicator roll surface and will eventuallyrequire replacement or refinishing of the roll. Additionally, as notedpreviously, it has been found that a doctor blade does not alwayssatisfactorily remove the surface film from the roller. Thesedisadvantages, however, are eliminated by means of the presentinvention. As seen in FIGURE 2, the roller 21 is rotated with itssurface spaced apart from that of the applicator roll 20. If roller 20had a smooth or slightly roughened surface, spacing roller 21 from itssurface would, as expected, leave a surface layer of adhesive on theapplicator with the thickness of the layer varying directly with thedegree of spacing. When using a celled applicator roll, however, anentirely different phenomenon is observed. Thus, with the roller 21spaced from the celled surface of the applicator roll, the surface 24 ofthe roll is substantially cleaned of all surface adhesive. Further, byvarying the distance at which the roller 21 is spaced from the roll 20,the amount of adhesive retained within the individual cells may also bevaried.

This is perhaps best illustrated in FIGURE 14 where adhesive consumptionis plotted against roll clearance for a B flute type medium and anadhesive having a viscosity of 30 Stein-Hall seconds. While therelationship is not a straight-line one, it will be seen that as theroll clearance is gradually increased from approximately 5-6one-thousandths of an inch up to approximately 16 thousandths of aninch, the rate of adhesive consumption also gradually increases fromabout .325 gallons per thousand square feet of board to approximately.675 gallons per M square feet. Thus, it will be seen that by varyingthe doctor rollapplicator roll clearance, and hence, the amount ofadhesive retained in the individual cells of the applicator roll,adhesive consumption rate can be varied over a range in excess of 100%.With the particular apparatus observed, it was also found that aboveapproximately 16 thousandths of an inch, a surface film will again beginto appear on the applicator roll, while below this value, the surface ofthe roll was, of course, substantially free of adhesive.

It will thus be seen that by utilizing a doctor roll spaced from thesurface of the celled applicator roll, not only may the surface of theapplicator roll be maintained substantially free of surface film withoutwearing of the roll, but a positive control of adhesive consumption isprovided.

Turning now to FIGURE 3 of the drawings there will be seen the adhesiveapplicator station 12, where adhesive is applied to the flute tips ofthe single faced board. As shown in FIGURE 3, station 12 includes acelled applicator roll 30, similar to roll 20, and rotating in a supplyof adhesive 31 contained in reservoir 32. As in the case of the singleface applicating station 6, a roll 33, provided with a scraper blade 34,is rotated in spaced relation to the surface of the applicator roll 30;thereby maintaining the surface of roll 30 free from adhesive andproviding a positive means of controlling the amount of adhesive in thecells thereof. As seen in FIGURE 11, a pair of arms 35 and 36 extendfrom fixed frame members and support, intermediate their lengths, arider roll 37 and flexing roll 38. At their outer ends each arm ispivotally attached to the piston rod of a piston and cylinderarrangement 39, which in turn is pivotally attached at its lower end toa portion of the supporting framework. Arms 35 and 36 are pivotallyattached to the fixed frame members by means of a cross shaft 40journaled at its ends in the frame members. Arm 36 may then be fixed toshaft 40 while arm 35 is free to pivot thereabout; allowing each arm topivot independently of the other. If desired, arm 35 may additionally beprovided with adjustable dog screws (not shown) in order that it mayalso be fixed to shaft 40 and allow both arms 35 and 36 to pivot inunison. Rider roll 37 is attached to the arms 35 and 36 by means of selfaligning bearings 41, which allow the rider roll some degree oftranslational as well as rotative movement with respect to its axis.Roller 38 may similarly be provided with such bearings.

From an inspection of FIGURES 3 and 11, it will be apparent that withthe piston and cylinders 39 exerting no force against the arms 35 and 36the entire weight of the arms and rollers 37 and 38 will bear againstthe single faced board through the nip formed by rider roll 37 andapplicator roll 30. Since, in a typical installation, this weight willgenerally result in a nip pressure in excess of the crushing strength ofthe board, means are provided for counterbalancing this weight andmaintaining the nip pressure at a predetermined value intermediate thatwhich would result in board crushing and that necessary to obtainadequate adhesive transfer from the applicator roll to the medium of thesingle faced board. This means comprises, as seen in FIGURES 3, and8-11, the pistons and cylinders 39 and a constant pressure pneumatic orhydraulic circuit associated with each. The constant pressure circuit,as shown in FIGURE 8, comprises a high pressure line 42 which branchesoff and supplies high pressure fluid to each of the reducing valves 43and 44. Reducing valve 43 reduces this pressure to a prede terminedvalue which may then be conveyed through solenoid operated, three wayvalves 45 and 46 to one of the pistons and cylinders 39. Reducing valve44 reduces the pressure in line 42 to a value below that effected byvalve 43 and allows this lower pressure to pass through pressure reliefvalve 47 and thence, when they are properly positioned, through threeway valves 45 and 46 to a piston and cylinder 39. The pressure in theline leading from valve 44 is set so that with valves 45 and 46positioned to block off pressure from reducing valve 43 and allowpressure from valve 44 to enter the cylinder 48, the force exerted atthe nip formed by rider roll 37 and applicator roll is counterbalancedby the pistons and cylinders 39 to give the desired nip pressure. Thispressure, as noted above, is that which is sufficient to obtain adequateadhesive transfer but yet not great enough to cause board crushing. Thepressure from valve 43, however, is substantially greater and withvalves 45 and 46 positioned as shown, the pressure in cylinder 48 isgreat enough to raise the assembly of arms and 36 and rollers 37 and 38for ready access to the interior of the applicating station 12. In orderto provide a fully automatic operation, solenoid operated valves and 46may conveniently be actuated by means of a centrifugal switch sensingthe speed of the process. In this manner, when the process is stoppedthe lifting pressure from reducing valve 43 passes directly throughvalves 45 and 46 to the bottom end of the cylinder 48 and moves thepiston 49 upwardly to lift the rider roll 37. In this case, the thirdports of valves 45 and 46 are both closed. As the process begins, valves45 and 46 are energized through the centrifugal switch (not shown) andassume the positions shown in FIGURE 9. In this position the input fromvalve 43 to valve 45 is blocked and the pressure from valve 44 feedsthrough valve 45 and valve 46. The input side of valve 46, however, isnow blocked and the pressure from cylinder 48 is allowed to vent throughline 50 causing the rider roll to rapidly drop towards its operatingposition. Just before reaching this position, however, limit switch 51is tripped by an arm (see FIGURE 3) de-energizing valve 46 so that thevalves assume the position shown in FIGURE 10. In this position, thevent line 50 is again blocked and the preset pressure from valve 44 maynow enter cylinder 48 to provide the counterbalancing force necessary togive the desired pressure at the nip formed by the rider roll 37 andapplicator roll 39.

As an example of the above operation, assume that the total forceexerted by the rider roll 37 at the nip is 1100 pounds. For a B flutetype board it has been found that six pounds per lineal inch of nip (6p.l.i.) is suflicient to give adequate adhesive transfer while about 8p.l.i., crushing may be encountered. Selecting the median value of 7p.l.i., therefore, it will be seen that with a board of inches width,the 1100 pounds pressure at the nip should be reduced to 60 7=420pounds. With rider roll 37 acting through a lever arm of 5 inches andpiston and cylinders 39 acting through a lever arm of 30 inches, it

will be seen that in order to obtain the desired nip pressure thecylinders must exert an upward force of 11C0420 5 30 or, 65 pounds perpiston and cylinder. Assuming each piston 49 to have an area of 5 squareinches, the pressure from reducing valve must be 65/5=13 p.s.i. in orderto give a nip pressure of 7 p.l.i. On the other hand, if the pressure ofreducing valve 43 is set at 30 psi. it will be seen that more thanenough force is exerted to raise the rider roll from the applicator rollwhen the process is stopped.

Since the proper nip pressure will vary with varying board widths, forconvenience of operation reducing valve 44 should be of the adjustabletype and pressure gauge 52 calibrated in inches of width of single facedboard rather than p.s.i. With this arrangement, when it is desired tochange the width of single face board to be run through the adhesiveapplicator station 12, the machine operator merely adjusts the reducingvalve 44 until a value in inches corresponding to the width of the boardto be processed is observed on the gauge 52. The correct line pressureto give the desired nip pressure for that width of board is thenprovided. In order to protect gauge 52 from any possible high pressurefeedback in the circuit, a pressure relief valve 47 may be installeddownstream thereof.

With the arrangement described above, it will be seen that if thecaliper of board passing through the rider roll applicator roll nipshould increase, the pressure in cylinders 48 and the lines leadingthereto will decrease. This decrease, however, is immediatelycompensated for by additional pressure being supplied through presetreducing valve 44 to the cylinders to maintain the nip pressuresubstantially constant. Conversely, should the caliper of board passingthrough the nip decrease, the pressure in cylinders 48 and associatedsupply circuit will increase. This pressure increase, however, isimmediately vented through pressure relief valve 47 to again maintainthe nip pressure at the desired value.

In addition to caliper variations in the machine direction, it should benoted that a situation will often be encountered where one edge of thesingle face board is thicker than desired and tapers to a dimension atthe opposite edge which is less than desired. With a fixed clearance nipthis would result in possible crushing of the thicker edge of the boardwhile the thinner edge would receive an inadequate supply of adhesive.By maintaining 130 pounds a constant pressure at the nip, however, andpermitting each of the arms 35 and 36 to pivot independently of theother, constant pressure may be maintained in the cross machine as wellas machine direction. Thus, as seen in FIGURES 12 and 13, as a board ofconstant transverse caliper passes between rider roll 37 and applicatorroll 30, the two rolls will be substantially parallel and exert asubstantially constant pressure throughout their length.

However, as a board of varying caliper transversely thereof moves intothe nip, the thicker edge of the board will tend to urge the end of therider roll adjacent thereto upwardly while the thinner edge will tend toallow the roll to move downwardly at that edge. Due to the independentmounting of the arms 35 and 36 and the use of self aligning bearings 41,roll 37 is allowed to move translationally with respect to its axis andpermit the constant pressure system to correctly equalize the pressureacross the nip.

From the foregoing it will be apparent that applicant has devised meansproviding a unique degree of control over adhesive consumption in themanufacture of corrugated board. While certain specific examples havebeen described it will be obvious that modifications thereof willreadily occur to those skilled in the art within the scope of theappended claims.

I claim:

1. A method of applying adhesive to a moving web comprising:

(a) rotating an applicator roll having a plurality of cells formed inits surface at a speed such that the surface speed of said roll issubstantially identical to the speed of a moving web in contacttherewith,

(b) applying adhesive to a portion of said roll in a quantity sufiicientto cover the surface of said portion and fill the cells in said portion,

(c) maintaining said surface of said roll free from contact with otherthan said web and said adhesive,

(d) simultaneously removing said surface covering of adhesive andregulating the amount of adhesive in said cells by rotating a doctorroll adjacent to said applicator roll but spaced therefrom by a distanceof .005 to .016 inch, and

(e) pressing the adhesive free surface of said applicator roll againstsaid web; whereby the adhesive in said cells is drawn therefrom andimprinted on said web.

2. The method of claim 1 further comprising:

(a) maintaining said applicator roll free from contact with other thansaid adhesive and said web.

References Cited UNITED STATES PATENTS 2,290,119 7/1942 Pityo 118212 X2,290,200 7/1942 Murch et al. 118-212 X 2,729,193 1/1956 Scholl 118212 X2,741,215 4/1956 Cady et a1 118-212 X 2,876,734 3/1959 Nitchie 1182493,036,927 5/1962 Jerothe 1187 3,046,935 7/1962 Wilson 118- -7 3,145,1188/1964 Mahoney 118-249 X 3,189,502 6/1965 Little 156210 FOREIGN PATENTS644,789 7/1947 Great Britain,

MORRIS KAPLAN, Primary Examiner.

UNITED PATENT gFFICE CERTIFICATE OF CORRECTION May 1Q; 1968 Dated PatentNo. 3 383 2 3H Invent0r(K) Willem A. Nikkel It: is certified that errorappears in the above-identified patent and that said Letters Patent arehereby corrected as shown below:

Claim 1 clause e) is amended to read as follows:

"pressing the web against the adhesivefree surface of said applicatorroll whereby the adhesive in said cells is drawn therefrom and imprintedon said web" Signed and sealed this 2nd day of November 1 971 (SEAL)Attest EDWARD M.FLE'I'CHER,JR. Atte sting Officer ROBERT GOTTSCHALKActing Commissioner of Patents

